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知。
答案：A
10．The author hopes to have the current situation in sports improved by ________. A．calling on players to use clean language on the court B．raising the referee's sense of responsibility
C．changing the attitude of players on the sports field
D．regulating the relationship between players and referees
解析：考查推理判断。根据文章倒数第三段中“It certainly gives proof of a court attitude which departs from normal behavior”和倒数第二段“Replacing the term ‘opponent’ with ‘associate’ could be an ideal way to start”可知，通过改变运动员在运动场的态度和行为来改善当前的体育现状。
答案：C